What mystery lies behind the windowless building in Manhattan at 33 Thomas Street? In the short documentary Project X, Oscar-winning filmmaker Laura Poitras (Citizenfour) teams with journalist Henrik Moltke to explore the building’s secrets. The film employs the voices of actors Rami Malek and Michelle Williams reading from NSA documents in the Snowden archives. Now streaming for free on Field of Vision, Project X complements an article in The Intercept written by Moltke and Ryan Gallagher called “Titanpointe: The NSA’s Spy Hub in New York, Hidden in Plain Sight.” Pure Nonfiction host Thom Powers interviews the filmmakers about their collaboration and Poitras’ work with Snowden.